coal fired steam boiler can be used in industry ,such as chemical plant ,dyeing factory and others; hot water boiler can be used in swimming poll ,hotel and residential area .Our main coal fired boiler is water-fire tube and wet back boiler .Threaded smoke tube is arranged into the boiler drum to increase thermal efficiency .For coal boiler is equipped with automatic coal feeding and slag remover.Good quality chain grate can resist high temperature to 1100 ℃ and long working life.Coal fired boiler is designed to be light pipe water cooled wall on the left and right sides .So it is compact structure ,compared with the same type of boiler ,can save some infrastructure investment of boiler room.